以下属于离心现象应用的是[ ] A. 离心沉淀器 B. 标枪运动员掷出的标枪 C

题型:不定项选择

问题:

以下属于离心现象应用的是[ ]

A. 离心沉淀器

B. 标枪运动员掷出的标枪

C. 家用洗衣机的甩干桶用于干燥衣物

D. 转动伞柄可将雨伞上的水甩出

考点:离心运动
题型:不定项选择

A man was walking along the street when he saw a woman carrying a large box. It was half in and half out of her car. So the man went up and said, “The box looks very heavy. Let me give you a hand.”

“That’s very kind of you,” the woman said, “I’m having a lot of trouble with it. Maybe it sticks (卡住) in the car door.”

“Together we’ll soon move it,” the man said. “I’ll get in and take the other end.” And he got in the car.

“Right,” the man said. “I’m ready,” and he began to push the box hard.

For several minutes, the man and the woman tried to move the box. Soon they felt very tired.

They rested for a moment. Then the woman said, “Let’s try again. One, two, three!” They went on moving the box.

At last, when they were exhausted, the man said, “I’m sorry, but I don’t think there’s any way to get it out of your car.”

“Get it out?” the woman cried. “I’m trying to get it in! You know?”

小题1: Where did this story happen?

A.At a bank.

B.In a shop.

C.In the street.

D.In the woman’s car.小题2:Who got in the car to move the box?

A.The woman.

B.The man.

C.Both of them.

D.Neither of them.小题3:The underlined word “exhausted” means “________” in Chinese.

A.精疲力竭的

B.激动的

C.充满希望的

D.沮丧的小题4: Which of the following is TRUE about the story?

A.The man stuck in the car door.

B.The woman asked the man for help.

C.The man refused to help the woman.

D.The woman tried to get the box into the car.小题5:What do you think of the man?

A.He is a helpful man.

B.He looks very strong.

C.He is funny and stupid.

D.He likes to play jokes on others.

题型:不定项选择

关于女性生殖器淋巴引流,错误的是()。

A.宫颈淋巴大部分汇入髂外淋巴结及骶前淋巴结

B. * * 下段的淋巴引流主要汇入腹股沟淋巴结

C. * * 上段淋巴大部分汇入闭孔淋巴结及髂内淋巴结

D.内生殖器淋巴分髂淋巴、腰淋巴和骶前淋巴组

E.宫体两侧淋巴可沿圆韧带入腹股沟浅淋巴结

题型:不定项选择

将一个质量为m的物体放在斜面上,并沿斜面方向向上施加一个拉力F,为了使物体能在斜面上处于静止状态,所用拉力的最小值为F1,最大值为F2,如图所示,则物体受到的最大静摩擦力为多少?

题型:不定项选择

设图书管理数据库中有3个表:图书.dbf、读者.dbf和借阅.dbf。它们的结构分别如下: 图书(总编号C(6),分类号C(8),书名C(16),出版单位C(20),单价N(6,2)) 读者(借书证号C(4),单位C(8),姓名C(6),性别C(2),职称C(6),地址C(20)) 借阅(借书证号C(4),总编号C(6),借书日期D(8)) 在上述图书管理数据库中,图书的主索引是总编号,读者的主索引是借书证号,借阅的主索引应该是 【9】

题型:不定项选择

绿色食品具备什么条件?

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